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Important Parts of an Espresso Machine A top espresso machine can create a shot of espresso with a rich body with a rich flavor, as well as an intense aroma. This requires high levels of temperature and pressure. Pay close attention to the crema. This golden-brown layer gives rich espressos their distinctive flavor and color. There are four kinds of espresso machines. They include manual, semi-automatic and automatic. Water reservoir The water reservoir is a container which holds cold, purified water that is pumped into the espresso machine. It is usually removable and comes with a lid in order to keep the water fresh and free of dust. It is an essential part of an espresso maker and should be kept clean in order to prevent clogging. Pour vinegar into the reservoir to cleanse it. Allow it to run for a few minutes. The espresso machine uses water to pressurize coffee grounds and extract flavors as well as caffeine, oils and flavor. It also produces crema, which is the foam. The first espresso machines were invented by Achille Gaggia and used pistons connected to levers to produce high-pressure coffee. Gaggia's spring piston levers pushed water through the coffee and into the cup, and introduced new terms for what people referred to as “coffee cream” (crema). The pump is an electric device that moves the water through the heating element to bring it up to the ideal brewing temperature of 195 degrees Fahrenheit. It is usually located at the bottom of the machine, and is connected to a tube that goes through the heating element. The tube connects at either end to the cold-water tube as well as the hot-water tube. It also runs under the heating elements that resist heat, which are covered with white grease to keep the plate warm. Pump There are many kinds of espresso machines. For instance certain machines use a vibratory or vibe pump that makes use of an electromagnetic motor that moves back and forth within a coil to create 60 pushes per second. The pump then forces water through the portafilter and out of the spouts. Other pumps employ an heating system, known as a thermoblock or thermocoil, to warm the water precisely to the temperature desired for making. These systems allow for the control of temperature and pressure, both of which are crucial for a good extraction. Pump-driven espresso machines may have a piston or spring design or an electric pump, but they all require water to pass through the coffee grounds under high pressure. The greater the pressure, the more delicious the extraction. The pump makes sure that the coffee is evenly distributed and helps to create a good crema. Steam-driven and piston-driven espresso machines are also available. In a steam driven machine, the water is forced through the ground coffee by using steam pressure. This model is more affordable however it does not provide the same amount of pressure needed for extraction. There are also air pump-driven espresso machines, which are smaller and lighter, but do not require a boiler and can be powered by a hand pump or a canister of compressed air (such as N2 or CO2). Air-pump espresso makers produce less espresso than pumps, but they can be more suitable for certain people. Steam Wand The steam wand is a thin metal pipe that comes from the espresso machine and releases hot, pressurized steam into your milk, resulting in foamy drinks like cappuccinos and lattes. The steam wand can also be used to heat water for cocoa, tea or other hot drinks. The wand comes with several holes that can be turned on and off to control the amount of steam released. Some machines come with the traditional wand, whereas others have a Pannarello wand, which is more simple to operate, but doesn't produce the same type of foam that is required for latte art. If you're having issues frothing milk, it could be that your espresso maker is having issues with its anti-vacuum device. This valve is designed in order to stop air from leaking into the steam wand when it is in use. You can test this by lowering the wand, and listening for a sound that screams. If you hear a sound that is hissing, this means air is being drawn in. You need to raise the wand to make sure it is submerged. You can also test the anti-vacuum by removing the wand, then washing it in warm water using a soft bristled brush or sponge. Cleaning the wand is essential to avoid clogs which could affect your frothing. If you are unable to fix it yourself, consult a technician or a manufacturer. Control panel The control panel of an espresso machine permits the user to set up and change settings. These include coffee strength and milk volume. These settings can be adjusted at any time. The display will also indicate the time when the machine has to be descaled and indicates if the water tank is full. Most espresso machines come with a hot water dispenser. coffee espresso machine is usually found next to or between the groups. It can be used for tea or to heat cups when needed. It's also great for cleaning and washing. A lot of models have gauges for pressure on the front of the machine, which indicate the current boiler pressure. A brew switch is available, that controls the brew procedure as well as the amount of shots. This is important, as the size of the espresso shot is determined by the length of time the grounds are in direct contact with the water. If desired the switch can be used to initiate the steaming process. The control system on this espresso machine is a little old-fashioned, but it has a user-friendly interface. It has a narrow LCD screen that appears like an LED. This makes it simple to navigate through the menus although there is some learning curve for those who aren't familiar with espresso machines. The stability of the temperature is also impressive. The machine can maintain a perfect temperature of 194deg to 208deg F throughout the entire brewing process. This guarantees a perfect aroma extraction, and a high-quality cup every time.